you could check out mason lake in washington. Its about an hour off of I-5 from Tacoma or Olympia. Its a good size lake and is always empty on weekdays. Check masonlakecabin.net for current conditions and weather. If you are not afraid of salt water the south puget sound around olympia has great water if the wind is low, The Willamette river south of portland is a well know riding spot. Their are some lakes around the Vancouver WA area too, though i have never been to any.
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